<!DOCTYPE html>
<html>
<head>
  <title>404 Not Found</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      background-color: #f4f4f4;
      margin: 0;
      padding: 0;
    }

    .container {
      max-width: 800px;
      margin: 0 auto;
      padding: 40px 20px;
      text-align: center;
    }

    h1 {
      font-size: 48px;
      color: #333;
    }

    p {
      font-size: 24px;
      color: #777;
    }

    a {
      color: #337ab7;
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }
  </style>
</head>
<body>
  <div class="container">
    <h1>404 Not Found...</h1>
    <p>The page you are looking for does not exist.</p>
    <p>Please check the URL or go back to the <a href="/">homepage</a>.</p>
  </div>
</body>
</html>
